REPORT ON THE BRACHYURA. 
IX 
Dana’s families Portunidse and Platyonychidae, and the new arrangement of the genera, 
in which I have reduced the number of the subfamilies, is a modification of that indicated 
by the eminent French carcinologist. 
In the Catometopa, or G-rapsoid Crabs, the increase in the number of the genera in 
the family Ocypodidse necessitated a revision of their classification, and I have accordingly 
proposed a new arrangement, differing alike from that of Dana and of H. Milne Edwards 
in 1852-54. 1 
Here, also, I have somewhat reduced and recharacterised the subfamilies, regarding 
as sectional divisions several which have been proposed, and thereby, it is hoped, 
simplifying the arrangement. Dana’s family, Mycteridse, is not sustained. 
In the Pinnotheridse, I have constituted a new subfamily, Hexapodinse, for those curious 
forms in which the fifth ambulatory legs are rudimentary or aborted. The arrangement 
of the Ocypodoidea now proposed agrees much more nearly with Dana’s than with that 
of Professor Milne Edwards, by whom the genera Mycteris, Scopimera and Dotilla 
(Doto) are separated from the Pinnotheridse. In uniting these three genera as a distinct 
subfamily, Mycterinse, of the Pinnotheridse, I have, I trust, violated no natural affinities, 
but rather relegated them to their true position in the system. 
In the Oxystomata, a somewhat heterogeneous group, which it will perhaps be found 
hereafter impossible to sustain in its entirety, 2 the arrangement followed is, as already 
stated, that of Dana. In rearranging the genera of the Leucosiidse, however, I have 
thought it advisable to establish two new subfamilies, pending a more thorough revision of 
the subject than time and opportunity allowed to be made in the present Report. 
1 Cf. Milne Edwards’ Memoire sur la famille des Ocypodiens, Ann. d. Sci. Nat., Zool., ser. 3, vol. xviii. pp. 128-164, 
pis. iii., iv., 1852 ; vol. xx. pp. 163-224, pis. vi.-xi., 1853. 
2 The diagnosis of this group, which was wanting in the MSS. when sent to Edinburgh, is supplied in the appendix 
to the Report. 
(zool. chall. exp.— part xlix.— 1886 .) 
Ccc b 
